Today, most of the uranium that powers U.S. nuclear reactors is imported. But many communities still suffer impacts of uranium mining and milling that occurred for decades to fuel the U.S.-Soviet nuclear arms race.

LAUSANNE, Switzerland — Iran and six world powers broke off nuclear negotiations ahead of schedule Friday to allow members of the Iranian delegation to attend the funeral of their president's mother, as a senior Russian official suggested that the sides…

GENEVA — The United States and Iran are working on a two-phase deal that clamps down on Tehran's nuclear program for at least a decade before providing it leeway over the remainder of the agreement to slowly ramp up activities…